Development of an Infrared Cavity Ringdown Spectroscopy Experiment and Measurements of Water Vapor Continuum Absorption [microform] PDF Download
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Author: John Gerald Cormier
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612690691
Category :
Languages : en
Pages : 226
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![Development of an Infrared Cavity Ringdown Spectroscopy Experiment and Measurements of Water Vapor Continuum Absorption [microform] PDF](https://books.google.com/books/content/images/frontcover/MHsCYAAACAAJ?fife=w80-h100)
Author: John Gerald Cormier
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612690691
Category :
Languages : en
Pages : 226
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Author: Hugh R. Carlon
Publisher:
ISBN:
Category : Atmospheric electricity
Languages : en
Pages : 33
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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We have carried out a detailed analysis of several long-path-length transmission measurements in the 8 to 12 micrometer atmospheric window in order to determine the extinction coefficient due to the water vapor continuum. Our results indicate that three modifications to the current LOWTRAN atmospheric transmission model are required. The first two corrections are an improved fit to the pure water vapor continuum absorption coefficient and the elimination of the atmospheric broadened continuum term. Finally, and most critically, a strong measured temperature dependence must be included in the water vapor continuum absorption coefficient. For path lengths ranging from 10 to 50 km, failure to incorporate these corrections can lead to errors in the computed transmission ranging from factors of 2 to more than 10,000.
Author: Joshua Barron Paul
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
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Author: Andrey I. Meshkov
Publisher:
ISBN:
Category : Absorption spectra
Languages : en
Pages : 146
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Abstract: It has been known for more than sixty years that all of the atmospheric absorption can not be accounted for by the standard lineshape theory. Remarkably, to this day there is no consensus on the physical origin of the "excess" absorption, called an atmospheric continuum. This is certainly due in no small part to the lack of accurate laboratory measurements, performed for a wide range of pressures, temperatures and frequencies. Unlike in low pressure gas phase spectroscopy where rapid change in the narrow lines absorption is used to remove the slowly varying baseline, quantification of slowly varying with frequency atmospheric absorption is much more difficult. In this thesis we will describe the instrument for the measurement of continua and other slowly varying absorption phenomena in the millimeter and submillimeter (a.k.a. terahertz) spectral region. By replacing the traditional frequency domain phase lock measurement of cavity Q with the time domain cavity ringdown this instrument can measure continua and broad line absorptions at ~6000 distinct cavity frequencies from 170 to 260 GHz in ~ 3 seconds. These near simultaneous measurements can include both regions dominated by contributions from near line center effects and other regions where "continua" effects are important. The result is a data set that contains, without the use of parameters from other experiments, all of the required experimental information. This approach significantly reduces systematic effects and makes possible more realistic assessment of errors. The instrument was used to study the absorption of nitrogen, oxygen, dry and moist air at a number of temperatures in -40 to +70 C range and pressures from 0 to 3 atmospheres. Results of the measurements were compared with current absorption models and previous laboratory measurements. In addition, we have used the developed technique to study the pressure broadening and pressure shift temperature behavior of the 183.310 GHz water line, important in the atmospheric remote sensing.
Author: Kenneth W. Busch
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 296
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Cavity-ringdown spectroscopy is an emerging method for making high sensitivity absorption measurements with gas-phase samples. This volume, the first devoted to the method, covers the history, theory, and numerous applications. Written by leaders in the field, it is a comprehensive guide to current methods and ongoing research.
Author: R. J. Nordstorm
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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Book Description
Attenuation of infrared absorption in the troposphere is dominated by water vapor absorption. Most past work on the spectroscopy of water vapor has been on the analysis of the rotational and vibrational bands. Efforts to model the continuum absorption have not been as successful. It is demonstrated here that the far-wing phenomena is important in modeling the small but significant absorption in the continuum regions. (Author).
Author: Andreas Reichert
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Hugh R. Carlon
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
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This report summarizes the results of a two-year study of atmospheric infrared 'continuum' absorption attributed to intermolecularly bonded clusters in water vapor. Spectral data are reviewed for water vapor, steam and liquid water. The infrared continuum absorption is discussed in detail and is shown to be explicable on the basis of homogeneous or ion-induced cluster distributions in water vapor, where the cluster population is approximately proportional to the square of the partial water vapor pressure. Thermodynamic consistency between the vapor and liquid phases is discussed for temperatures including the critical (374 C) where the phases become one. Simple oscillator models are shown to give agreement with observed spectral lines, suggesting certain cluster configurations. The ion concentration of moist air versus temperature is discussed, and measurements of ion cluster distributions are considered. Cluster absorption at longer wavelengths including the microwave region is discussed. Conclusions are presented.
Author:
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ISBN:
Category :
Languages : en
Pages : 0
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The objectives of this effort were as follows: (1) extend the technical development of pulsed infrared (IR) cavity ringdown spectroscopy to longer wavelengths and higher spectral resolution; (2) develop its capacity as a general tool for trace gas analysis; and (3) study spectra, structures, hydrogen tunneling dynamics of hydrocarbon ions and complexes of relevance to ion-enhanced combustion processes. High-resolution, pulsed infrared cavity ringdown laser spectroscopy was developed and implemented for the study of carbon clusters and hydrocarbon ions. Several supersonic molecular beam sources of ions and hydrocarbons were constructed and tested by infrared cavity ringdown spectroscopy. The Stokes downconversion of pulsed visible laser radiation into the mid-infrared was explored in solid and liquid hydrogen media in an effort to explore more powerful and convenient infrared sources. Cavity ringdown studies of several different carbon/hydrocarbon systems were carried out. Nine related publications and three conference presentations are listed.
